将来时态： will/would/shall/should + be
used to be
情态动词后，如：must/can/may/could/might等等 + be
虚拟语气：should +动词原形
如： The teacher required that we should be careful in our lessons.
used to be
情态动词后，如：must/can/may/could/might等等 + be
虚拟语气：should +动词原形
如： The teacher required that we should be careful in our lessons.
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